"PLEG is not healthy" errors on OpenShift nodes.

Solution Verified - Updated -

Issue

  • OpenShift node becomes not ready, events show PLEG becomes unresponsive:

    Ready       False   Mon, 13 Nov 2017 13:41:40 +0530     Sun, 05 Nov 2017 18:22:28 +0530     KubeletNotReady         PLEG is not healthy: pleg was last seen active 3m20s ago; threshold is 3m0s
    
  • PLEG is not healthy: pleg was last seen active 3m9.71452035s ago; threshold is 3m0s

  • GenericPLEG: Unable to retrieve pods: rpc error: code = Unknown desc = Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
  • Node appears to be hung - in 'notReady' status with PLEG errors and pods in 'Unknown' status

Environment

  • OpenShift Container Platform 3

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